Pit Volume Indicator

Pit Volume Indicator

Definition(s)

Pit Volume Indicator

A device installed in the drilling fluid tank to register the fluid level in the tank. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards  
Pipe Ram

Pipe Ram

Definition(s)

Pipe Ram

A closing and sealing component in a ram blowout preventer that seals around the ouside diameter of a tubular in the wellbore. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards  

Pipe Ram

A closing and sealing component in a ram blowout preventer that seals around the outside diameter of a specific size tubular in the wellbore. Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards  

Pipe Rams

Rams whose ends are contoured to seal around pipe to close the annular space. Separate rams are necessary for each size (outside diameter) pipe in use. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global Standards  

Pipe Ram

Closing and sealing component in a ram blowout preventer that seals around tubulars in the wellbore. Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global Standards Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global Standards  

Pipe Rams

“Pipe ram” means a large valve which is usually installed above the ram preventers and which forms a seal in the annular space between the pipe and wellbore. [Mich. Admin. Code R 408 (2013)]. Source: Oil and Gas Drilling and Servicing Operations, Michigan Administrative Code R 408, February 8, 2013. Regulations
P&ID

P&ID

Definition(s)

P&ID

Piping and instrumentation diagram. Source: API STD 521, Pressure-relieving and Depressuring Systems, Sixth Edition, January 2014. Global Standards Source: ISO 17776:2016, Petroleum and natural gas industries — Offshore production installations — Major accident hazard management during the design of new installations, Second Edition, December 2016. Global Standards Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards Source: Oil & Gas UK, Guidelines on subsea BOP systems, Issue 1, July 2012, Global Standards  

P&ID

Process and Instrument Diagram. Source: API RP 14G, Recommended Practice for Fire Prevention and Control on Fixed Open-type Offshore Production Platforms: Upstream Segment, Fourth Edition, April 2007. Global Standards
Original Equipment Manufacturer

Original Equipment Manufacturer

Definition(s)

Original Equipment Manufacturer

The organization responsible for the original design and initial manufacture, as well as for ensuring conformance to initial acceptance criteria of the managed product.

Source: API STANDARD 18LCM, Product Life Cycle Management System Requirements for the Petroleum and Natural Gas Industries, First Edition, April 2017. Global Standards

Original Equipment Manufacturer

Design owner or manufacturer of the traceable assembled equipment, single equipment unit, or component part. Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global Standards Source: API STANDARD 16AR, Standard for Repair and Remanufacture of Drill-through Equipment, First Edition, April 2017. Global Standards

Original Equipment Manufacturer (OEM)

The design owner or manufacturer of the traceable assemble equipment, single equipment unit, or component part. NOTE: If any alterations to the original design and/or assembled equipment or component part are made by anyone other than the OEM, the assembly, part, or component is not considered an OEM product. The party that performs these alterations is then considered as the OEM. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards
OEM

OEM

Definition(s)

OEM

Design owner or manufacturer of the traceable assembled equipment, single equipment unit, or component part. Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global Standards Source: API STANDARD 16AR, Standard for Repair and Remanufacture of Drill-through Equipment, First Edition, April 2017. Global Standards  

OEM

The organization responsible for the original design and initial manufacture, as well as for ensuring conformance to initial acceptance criteria of the managed product.

Source: API STANDARD 18LCM, Product Life Cycle Management System Requirements for the Petroleum and Natural Gas Industries, First Edition, April 2017. Global Standards

OEM

Original Equipment Manufacturer. Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global Standards Source: API STANDARD 18LCM, Product Life Cycle Management System Requirements for the Petroleum and Natural Gas Industries, First Edition, April 2017. Global Standards Source: API STANDARD 16AR, Standard for Repair and Remanufacture of Drill-through Equipment, First Edition, April 2017. Global Standards Source: ISO 16530-1:2017, Petroleum and natural gas industries — Well integrity – Part 1: Life cycle governance, First Edition, March 2017. Global Standards Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards Source: API RP 7G-2, Recommended Practice for Inspection and Classification of Used Drill Stem Elements, First Edition, August 2009. Global Standards Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global Standards Source: NOGEPA Industrial Guideline No. 43, Surface BOP Review, Best Practices Checklist, Netherlands, Version 0, December 2011. Global Standards Source: NORSOK D-001, Drilling facilities, Rev. 3, December 2012. Global Standards Source: Oil & Gas UK, Guidelines on subsea BOP systems, Issue 1, July 2012, Global Standards Source: Rules for Classification – Offshore units, DNVGL-OU-0101, Offshore drilling and support units, DNV GL, July 2015. Global Standards
NIST

NIST

Definition(s)

NIST

National Institute of Standards and Technology (U.S.). Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards  

NIST

National Institute of Standards and Technology. Source: API SPEC 5CT, Specification for Casing and Tubing, Upstream Segment, Ninth Edition, July 2011 (Errata September 2012). Global Standards Source: API SPEC 13A, Specification for Drilling Fluids Materials, Eighteenth Edition, February 2010. Global Standards  
MWP

MWP

Definition(s)

MWP

Maximum working pressure. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards  
MUX

MUX

Definition(s)

MUX

Multiplex Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards

MUX

Multiplex systems. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards  

MUX

Multiplexed. Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards Source: Deepwater Well Control Guidelines. IADC Guidelines  

MUX

electro/hydraulic multiplex control system for BOPs Source: Oil & Gas UK, Guidelines on subsea BOP systems, Issue 1, July 2012, Global Standards
MoC

MoC

Definition(s)

MoC

Management of change. Source:  DNVGL-RP-G108, Cyber security in the oil and gas industry based on IEC 62443, DNV GL, September 2017. Global Standards Source: API 510, Pressure Vessel Inspection Code: In-service Inspection, Rating, Repair, and Alteration, Tenth Edition, May 2014, with Addendum May 2017. Global Standards Source: API 570, Piping Inspection Code: In-service Inspection, Rating, Repair, and Alteration of Piping Systems, Fourth Edition, February 2016, with Addendum May 2017. Global Standards Source: ISO 16530-1:2017, Petroleum and natural gas industries — Well integrity – Part 1: Life cycle governance, First Edition, March 2017. Global Standards Source: API RP 781 Security Plan Methodology for the Oil and Natural Gas Industries.1st Ed. September 2016. Global Standards Source: API STD 521, Pressure-relieving and Depressuring Systems, Sixth Edition, January 2014. Global Standards Source: ISO 17776:2016, Petroleum and natural gas industries — Offshore production installations — Major accident hazard management during the design of new installations, Second Edition, December 2016. Global Standards Source: API SPEC Q1, Specification for Quality Management System Requirements for Manufacturing Organizations for the Petroleum and Natural Gas Industry, Ninth Edition, June 2013 (Errata 2, March 2014). Global Standards Source: API  Bulletin 97, Well Construction Interface Document Guidelines, First Edition, December 2013. Global Standards Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards Source: IOGP Report No. 510, Operating Management System Framework for controlling risk and delivering high performance in the oil and gas industry, International Association of Oil & Gas Producers, June 2014. Global Standards Source: OGP Report No. 456, Process Safety – Recommended Practice on Key Performance Indicators, International Association of Oil & Gas Producers, November 2011. Global Standards Source: OGP Report No. 476, Recommendations for enhancements to well control training, examination and certification, International Association of Oil & Gas Producers, October 2012. Global Standards Source: NOGEPA Industrial Guideline No. 41, Well Construction Process Checklist, Drilling Best Practices, Netherlands, Version 0, December 2011. Global Standards Source: NOPSEMA Guidance note: Safety Case Lifecycle Management, N04300-GN0087, Australia, Revision 5, December 2012. Regulatory Guidance Source: NOPSEMA Guidance Note: Safety Management Systems, N04300-GN1052, Australia, Revision 0, December 2012. Regulatory Guidance  

MOC

A documented management system for review and approval of changes (both physical and process) to pressure vessels prior to implementation of the change. The MOC process includes involvement of inspection personnel that may need to alter inspection plans as a result of the change.

Source: API 510, Pressure Vessel Inspection Code: In-service Inspection, Rating, Repair, and Alteration, Tenth Edition, May 2014, with Addendum May 2017. Global Standards  

MoC

A documented management system for review and approval of changes (both physical and process) to piping systems prior to implementation of the change. The MOC process includes involvement of inspection personnel that may need to alter inspection plans as a result of the change.

Source: API 570, Piping Inspection Code: In-service Inspection, Rating, Repair, and Alteration of Piping Systems, Fourth Edition, February 2016, with Addendum May 2017. Global Standards  

MoC

The management of change (MoC) process identifies risks arising from changes. It manages these risks before and during execution of the changes, thus ensuring they do not inadvertently increase risk from existing or new conditions, hazards, impacts, exposures or threats. MoC can apply to process changes (hardware or process conditions), procedural changes and organisational changes. The process includes steps for review and authorization prior to implementation, as well as steps to ensure that the change is communicated and pertinent documents are kept up to date. Source: IOGP Report No. 510, Operating Management System Framework for controlling risk and delivering high performance in the oil and gas industry, International Association of Oil & Gas Producers, June 2014. Global Standards
MGS

MGS

Definition(s)

MGS

Mud gas separator. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards  

MGS

Mud/gas separator. Source: NORSOK D-001, Drilling facilities, Rev. 3, December 2012. Global Standards  
MEWSP

MEWSP

Definition(s)

MEWSP

Maximum expected wellbore shear pressure. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards  
Maximum Expected Wellbore Shear Pressure

Maximum Expected Wellbore Shear Pressure

Definition(s)

Maximum Expected Wellbore Shear Pressure (MEWSP)

The expected pressure for a given hole section, a specific shear pressure requirement, specific operating piston design, and material specification, to shear drill pipe or tubing at MASP (surface), MAWHP (subsea), or other pressure limiting value. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards  
Maximum Anticipated Wellhead Pressure

Maximum Anticipated Wellhead Pressure

Definition(s)

Maximum Anticipated Wellhead Pressure (MAWHP)

The highest pressure predicted to be encountered at the wellhead in a subsea well. NOTE: The MAWHP may be calculated for each hole section during well construction. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards  
Maximum Anticipated Surface Pressure

Maximum Anticipated Surface Pressure

Definition(s)

Maximum Anticipated Surface Pressure (MASP)

A design load that represents the maximum pressure that may occur in the well during the construction of the well. NOTE: As with land and shelf wells, the MASP is a surface pressure. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards  

Maximum Anticipated Surface Pressure (MASP)

A design load that represents the maximum pressure that can occur at the surface during well construction or production. Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards  

Maximum Anticipated Surface Pressure

The highest pressure predicted to be encountered at the surface of the well. This pressure prediction should be based upon formation pressure minus a wellbore filled with native formation fluid at current conditions. If formation fluid information is unknown, this pressure prediction should be based upon formation pressure minus a wellbore filled with dry gas from the surface to the completion interval. Source: NORSOK D-002, Well intervention equipment, Rev. 2, June 2013. Global Standards  
MAWHP

MAWHP

Definition(s)

Maximum allowable working pressure (MAWP)

The maximum gauge pressure pennitted at the top of a pressure vessel in its operating position for a designated temperature. This pressure is based on calculations using the minimum (or average pitted) thickness for all critical vessel elements, (exclusive of thickness designated for corrosion) and adjusted for applicable static head pressure and non-pressure loads, e.g. wind, earthquake, etc. Source: API 510, Pressure Vessel Inspection Code: In-Service Inspection, Rating, Repair, and Alteration Downstream Segment, Ninth Edition, June 2006. Global Standards  

MAWHP

Maximum anticipated wellhead pressure. Source: API  Bulletin 97, Well Construction Interface Document Guidelines, First Edition, December 2013. Global Standards Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards  

MAWHP

Maximum anticipated wellhead pressure (for subsea wells). Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards  
MASP

MASP

Definition(s)

MASP

Maximum anticipated surface pressure. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards Source: API  Bulletin 97, Well Construction Interface Document Guidelines, First Edition, December 2013. Global Standards Source: OGP Report No. 476, Recommendations for enhancements to well control training, examination and certification, International Association of Oil & Gas Producers, October 2012. Global Standards  
Lower Kelly Valve

Lower Kelly Valve

Definition(s)

Lower Kelly Valve

A full-opening valve installed immediately below the kelly, with outside diameter equal to the drill pipe tool joint outside diameter. NOTE 1: This valve can be closed under pressure to remove the kelly and can be stripped into the hole if a closed IBOP valve is installed above it. NOTE 2: Some lower kelly valve models are not designed to withstand external pressure encountered in stripping operations. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards  

Lower Kelly Valve

An essentially full-opening valve installed immediately below the kelly, with outside diameter equal to the tool joint outside diameter. Valve can be closed to remove the kelly under pressure and can be stripped in the hole for snubbing operations. Source: API RP 7G, Recommended Practice for Drill Stem Design and Operating Limits, Upstream Segment, Sixteenth Edition, August 1998 (Addendum 2: September 2009). Global Standards  

Lower Kelly Valve (Kelly Cock)

Essentially full-opening valve installed immediately below the kelly, with outside diameter equal to the tool joint outside diameter. NOTE The valve can be closed to remove the kelly under pressure and can be stripped in the hole for snubbing operations. Source: API RP 7G-2, Recommended Practice for Inspection and Classification of Used Drill Stem Elements, First Edition, August 2009. Global Standards  
Lost Returns

Lost Returns

Definition(s)

Lost Returns

Loss of drilling fluid into the formation resulting in a decrease in pit volume. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards  

Lost Returns

See Lost Circulation. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global Standards  
Kick

Kick

Definition(s)

Kick

Influx of reservoir fluid into the wellbore during drilling or workover that results in shutting in the well and increased pressure below the shut-in device (usually a BOP). Source: API Standard 2RD, Dynamic Risers for Floating Production Systems, Second Edition, September 2013. Global Standards

Kick

Influx of formation liquids or gas into the wellbore. NOTE: Without corrective measure, this condition can result in a blowout. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards  

Kick

Intrusion of formation fluids into the well bore. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global Standards  

Kick

Unplanned, unexpected influx of liquid or gas from the formation into the wellbore, where the pressure of fluid in the wellbore is insufficient to control the inflow. If not corrected can result in a blowout. Source: IADC UBO / MPD Glossary, December 2011. Global Standards  

Kick

"Kick" means the intrusion of formation liquids or gas that results in an increase in circulation pit volume. Without corrective measures, this condition can result in a blowout. Source: Corporation Commission, Oil and Gas Conservation, Oklahoma Administrative Code 165:10, February 2013. Regulations
IOM

IOM

Definition(s)

IOM

Installation, operation, and maintenance. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards  
Interlock Sequencing

Interlock Sequencing

Definition(s)

Interlock Sequencing

An arrangement of control system functions designed to require the actuation of one function as a prerequisite to actuate another function. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards  
Inside Blowout Preventer (IBOP)

Inside Blowout Preventer (IBOP)

Definition(s)

Inside Blowout Preventer (IBOP)

A device that can be installed in the drill string that acts as a check valve allowing drilling fluid to be circulated down the string but prevents back flow. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards  

Inside BOP

A device that can be installed in the drill string that acts as a check valve allowing drilling fluid to be circulated down the string but prevents back flow. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global Standards  
IBOP

IBOP

Definition(s)

IBOP

Inside blowout preventer. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards  
Hydrostatic Head

Hydrostatic Head

Definition(s)

Hydrostatic Head

The pressure that is exerted at any point in the wellbore, due to the weight of the column of fluid above that point. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards  

Hydrostatic Head

The true vertical length of fluid column, normally in feet. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global Standards  

Hydrostatic Head

The true vertical length of fluid column, normally in ft. Source: API RP 64, Recommended Practice for Diverter Systems Equipment and Operations, Second Edition, November 2001 (March 1, 2007). Global Standards  
Hydrogen Sulfide Equipment Service

Hydrogen Sulfide Equipment Service

Definition(s)

Hydrogen Sulfide Equipment Service

Equipment designed to resist the effects caused by exposure to hydrogen sulfide (H2S). Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards  
Hydraulic Chamber Test

Hydraulic Chamber Test

Definition(s)

Hydraulic Chamber Test

The application of a pressure test to any hydraulic operating chamber. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards  
High-pressure, High-temperature Well

High-pressure, High-temperature Well

Definition(s)

High-Pressure, High-Temperature Well

Wells with a potential pressure greater than 15,000 psi (103.42MPa) at the wellhead or with a potential flowing temperature of greater than 350 °F (177 °C) at the wellhead. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards  
Hang-off

Hang-off

Definition(s)

Hang-Off

An action whereby the weight of that portion of the drill string below a ram BOP is supported by a tool joint resting on the closed pipe ram or through the use of a special hang-off tool that lands in the wellhead. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards  

Hang-Off

Riser when disconnected from seabed. NOTE Hang-off is usually differentiated from disconnected. Disconnected is normally the condition directly after disconnecting the riser. Hang-off is normally associated with the riser suspended from the rotary table. Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global Standards  
Gate Valve

Gate Valve

Definition(s)

Gate Valve

A valve that employs a sliding gate to open or close the flow passage. NOTE: The valve may or may not be full opening. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards  

Gate Valve

A valve that employs a sliding gate to open or close the flow passage. Source: API RP 64, Recommended Practice for Diverter Systems Equipment and Operations, Second Edition, November 2001 (March 1, 2007). Global Standards  

Gate Valve

Valve assembly with a gate operating within the body, 90° to the conduit, to effect a closure. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards  

Gate Valve

Valve that closes by lowering a flat plate or gate to block the flow through the valve. Source: IADC UBO / MPD Glossary, December 2011. Global Standard
Function Test

Function Test

Definition(s)

Function Test

Closing and opening (cycling) equipment to verify operability. Source: API RP 64, Recommended Practice for Diverter Systems Equipment and Operations, Second Edition, November 2001 (March 1, 2007). Global Standards

Function Test

The operation of a piece of equipment or system to verify its intended operation. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards  

Function Test

"Function-test" means to actuate a component to demonstrate its proper functioning without subjecting it to pressure. Source: Alaska Oil and Gas Conservation Commission, Definitions, Alaska Admin. Code tit. 20, § 25.990, December 7, 2012. Regulations